* {
  padding: 0;
  margin: 0;
}
li {
  list-style: none;
}
.todos {
  width: 600px;
  margin: 50px auto;
  border: 1px solid #2e2e2e;
}
header {
  display: flex;
  width: 100%;
  height: 60px;
  align-items: center;
  border-bottom: 1px solid #2e2e2e;
}
header > input {
  outline: none;
  box-sizing: border-box;
  height: 100%;
  padding: 0 20px;
  font-size: 25px;
  border: 0;
  width: 100%;
  display: block;
}

section {
  width: 100%;
}
section > ul {
  display: flex;
  flex-direction: column;
}
section > ul > li {
  height: 50px;
  border-bottom: 2px solid #ccc;
  display: flex;
  align-items: center;
  padding: 0 20px;
}